Answer:
C. the chaos of a new age's beginning
Explanation:
Yeats describes in the excerpt a vision of chaotic things happening, and the world loosing control, a gyre is an upward spyral that continues to the infinity and usually falcons fly in circles only to fall again into their falconer´s hand, but this one can´t hear the falconer, so he is trapped in that spyral forever, he then sees the centre falling apart, which is a reference to the governments and centralized order, what´s next is just the chaos, of the destruction and the anarchic process of reconstruction.